init: Use the stringify operator for the __define_initcall macro

init: Use the stringify operator for the __define_initcall macro

Currently the __define_initcall macro takes three arguments, fn, id
and level. The level argument is exactly the same as the id argument
but wrapped in quotes. To overcome this need to specify three
arguments to the __define_initcall macro, where one argument is the
stringification of another, we can just use the stringification macro
instead.

Signed-off-by: Matthew Leach <matthew@mattleach.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>